Evaluation of a system composed by upward filtration and ultraviolet radiation in the treatment of rainwater

Abstract

The objective of this work was to characterize the quality of rainwater after passing through the rapid filtration system followed by disinfection by ultraviolet radiation, besides analyzing the characterization of rainwater quality after passing through the filber cement roof and to evaluate the possible uses of the rainwater, besides evaluating the efficiency of the proposed treatment. The treatment system consists of a gravel, sand and coal filter followed by a reactor with germicidal lamps for the disinfection of collected rainwater. The results show that the rainwater quality stored in tank 1 is comparable to class 1 water bodies according to CONAMA Resolution 357/2005 and therefore a simplified treatment could be applied to make it potable. According to the analyzed parameters, the quality of the rainwater after the proposed treatment met the standards required by ABNT NBR 15527: 2007: 2007 and USEPA (2012) for non potable uses and that the analyzed parameters (pH, Temperature, Color, Turbidity, OD, COD, NH 3, NO 2, NO 3, PO 43, SO 42, CT, CT and EC) meet the standards required by Ministry of Health Ordinance 2914/2011 for drinking water. Water obtained after treatment can be used for non-potable purposes and in direct contact activities such as bathing and laundry and thus minimizing the demand for drinking water. In this way, do not limit the use of rainwater only for non-noble purposes, such as discharge of toilets, irrigation of garden and cleaning of sidewalks.